Dunstan is a non-playable character from original Final Fantasy XIV.
Dunstan is Fye's older brother. He is part of a group of Gods' Quiver and Wood Wailers who have officially undergone greenwrath so they can carry out a secret mission. The party ends up being discovered by Khrimm, Fye's friend and son of Sigurdh and Oona who are also in the same party as Dustan. Khrimm does not hear about the mission and asks to return to Gridania. When the request is refused, Khrimm sets fire to a tree to awaken the greenwrath on himself in an attempt to show that the elementals do not exist. But Khrimm was wrong and ends up petrified by greenwrath.
While O-App-Pesi analyzes Khrimm's condition, Papalymo and Yda return from the wood with Dunstan. E-Sumi-Yan orders a great purification ritual, but fears that saving young Khrimm may demand that Dunstan give his life. Fye tries to see Khrimm, but fearing that Khrimm's greenwrath would be transmitted to Fye, O-App-Pesi denies the visit and instead asks him to warn Fye that her brother has returned to Gridania. Once the purification ritual is performed, Dunstan loses consciousness and Khrimm is effectively healed without the need for Dunstan to offer his life in return.